RCE in Anthropic Claude Code
CVE-2025-65099
Claude Code is an agentic coding tool. Prior to version 1.0.39, when running on a machine with Yarn 3.0 or above, Claude Code could have been tricked to execute code contained in a project via yarn plugins before the user accepted the startup trust dialog. Exploiting this would have required a user to start Claude Code in an untrusted directory and to be using Yarn 3.0 or above. This issue has been patched in version 1.0.39.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Anthropic Claude Code
- Anthropics Claude-Code — versions < 1.0.39
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/anthropics/claude-code/security/advisories/GHSA-5hhx-v7f6-x7gv (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-65099?
- CVE-2025-65099 is a critical-severity vulnerability in Anthropic Claude Code, classified under Code Injection. CVSS score: 9.8/10. Published 2025-11-19.
- How severe is CVE-2025-65099?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2025-65099 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.